<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8" %>
<html>
<body>
<h2>Hello World!</h2>
<form action="/demo/login" method="post">
    用户名：<input type="text" name="username"/>密码：<input type="text" name="password"/><input type="submit"/>
</form>
</body>
</html>
